Paper positioning apparatus for typewriters



Aug. 23, 1938. c. WETTENMYER 2,127,793

PAPER POSITIONING APPARATUS FOR TYPEWRITERS Filed Sept. 16, 1956 2 sheets-sheet 1 INVENTOR. C ARLOS WKTTEHMYER.

' ATTORNEY.

Aug. 23, 1938. c. WITTENMYER PAPER POSITIONING APPARATUS FOR TYPEWRITERS Filed Sept. 16, 1936 2 Sheets-Sheet 2 INVENTOR.

C ARLOS WITTENMYER.

ATTORNEY.

Patented Aug. 23, 1938 UNITED STATES PAPER POSITIONING APPARATUS FOR TYPEWBITEBS Carlos Wlttenmyer, Mount Clemens, Mich. Application September 16, 1936, Serial No. 100,978

3 Claims. (Cl. 197-127) My invention relates to paper positioning ap paratus for typewriters and an object of my improvements is to secure greater speed, accuracy, and convenience in placing the sheet of paper to be written upon into the typewriter.

I secure this object in the construction shown in the accompanying drawings in which:

Figure l is a plan view of the apparatus embodying my invention and so much of a typewriter as is necessary to show its connection therewith.

Figure 2 is a section on the line B, 28, Figure 1, the platen being nearly but not quite returned to operative position.

Figure 3 is an end elevation of the same looking from below Figure 1, the platen being in operative position.

Figure 4 is a view similar to Figure 3, the platen being thrown back.

Figure 5 is a similar view the platen being near the end of its travel toward its operative position.

2 is the typewriter table and 3 the frame of the machine thereon.

4 is a table secured at the rear of the frame 3 with its front edge parallel to and nearly on a level with the axis of the platen 5. The table 4 inclines slightly backward, 40-, are slots in the table 4 extending parallel and adjacent to its side edges. 6--G, are stops or gages secured upon the surface of the table 4 by set screws Boa-6a and adjustable along the slots 411-411. I is the bail-bar and la -1a, are gages adjustable longitudinally to different positions thereon.

8-8 are the swinging arms of the platen carrying frame pivoted at 38-38 to the frame 3. 9--9 are arcuate cams secured to the arms 8-8, extending backward therefrom and having cam faces 9a, and 91) extending outward from their peripheral edges. Ill-l0 are swinging arms pivoted at Ilia-Illa. at the opposite edges of the table 4. II is a presser bar extending between the free ends of the levers Ill-Ill and across the surface of the table 4. l3--l3 are torsional coil springs acting upon the arms Iii-i0, to activate the bar ll toward the surface of the table 4. Ila-Ila. are soft rubber bands around the presser-bar ll. I2--l2 are friction rollers upon pintles extending horizontally outward from the levers Iii-40 and engaging upon the arcuate edge of the cam 9, so that the cam faces 9a, 9b shall act upon said rollers to oscillate the arms l0 and raise the bar ll. When the rollers l2 are between the cam surfaces 9a and 9b the rubber bands Ila are pressed against the surfaces of the sheet of paper on the table 4, by the springs I3.

When said rollers are acted upon by said cam faces the bands II a are raised up.

The above described apparatus is used as follows:

The gages 'la-'la are set a distance apart on the bail bar 1 approximately equal to the width of the sheet of paper that is to be used and the gages 6-8 are located upon the surface of the table 4 to correspond to the length of said sheet. The platen being thrown back as shown in Fig- 10 ure 4, the rollers are upon the cam faces 9a, and the bar II and bands II a are raised a considerable distance above the table 4. The sheet of paper 8 is now inserted between the gages la-4a. and its rear edge caused to engage the 15 gages 8-8 as shown most distinctly in Figure 1.

The platen is now drawn downward toward its operative position which brings the cam faces So from under the rollers l2-l2 allowing the springs l3--I3, to swing the arms l0 and clamp the sheets S between the rubber bands Ila and the surface of the table 4. The platen move ment is continued engaging the paper S and bending it down as shown in Figures 2 and 5, the clamping bar l-l holding the front edge in position, until the platen is almost to its opera- 5 tive position as shown-in Figure 5 when the cam 9b engages the rollers l2 and raises the clamping bar slightly from the sheet of paper. The platen then completes its travel and is in operative 30 position as shown in Figure 3.

The cam face So is made of sufficient height so that the presser bar ll shall be raised thereby sumciently to be out of the way when the sheet S is inserted; the cam 9b is of less height as it is only desired to release the paper when the platen comes to its operative position.

In this way the operator inserts the sheet from the front into an open space and its position is accurately determined by the gages lala and 6-6. It is not necessary to move any part of 40 the machine to insert the paper.

What I claim is:

1. In combination with a typewriter having a platen roller in a swinging frame adapted to be turned upward from, and downward to operative 45 position, a table extending in position adapted to feed a sheet of paper to said typewriter, and having a gage stop thereon adapted to locate the sheet of paper in position to be written on, means for clamping said sheet of paper in said position, and a cam on said swinging frame adapted to engage said clamping means to open said clamping means at each end of the travel of the platen.

2. In combination with a typewriter having a 56 platen roller in a swinging frame adapted to be turned upward from, and downward to operative position, a table extending in position adapted to feed a sheet of paper to said typewriter and having a gage stop thereon adapted to locate the sheet of paper in position to be written on, a clamping means yieldingly urged toward said table, a part secured to turn therewith, said part having an arcuate edge having its center at the axis of said frame and being provided with cam surfaces at its ends, said clamping means engaging upon said arcuate edge to be raised by said cam surfaces.

3. In combination with a typewriter having 9.

adapted to engage said clamping means to raise 10 the same from clamping position at each end of the motion of said frame.

CARLOS WI'I'IENMYER. 

